Post on 25-Feb-2021
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Log Book Grading
•You can collect 5% of your overall grade during the course of thesemester by keeping a logbook and regularly recording entries
•I will periodically ask to see your log book over the semester•If I fail to see quality entries as time progresses, I will mark downfrom this 5%.
•I will collect the logbooks at the end of semester to assign a finalgrade
Engineering Design – The Process
Engineering Design:Exercise in Problem Solving
•Establish that there IS a problem•Understand problem
• Develop problem definition• Decide on the project requirements• Gather information (lit review / market research)
•Generate possible solutions – Idea generation•Evaluate solutions against requirements•Recommend one – where EGR386w ends•Test and Refine Prototype – where Capstone ends
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The Design ProcessProject
Defini-on andPlanning
Specifica-onsDefini-on
ConceptualDesign
ProductDevelopment
Product SupportCycle back
Progressforward
The Design Process
[1] G.E. Dieter and L.C. Schmidt, “Engineering Design,” in Engineering Design, 5th Ed. New York, NY: McGraw Hill,2013, ch. 1, pp. 15.
Why is a Design ProcessImportant?
•Quality• Ensures the product “works the way it should”
“Meets or exceeds my (customer’s) needs”
•Design process is the act of literally driving the product to ‘work theway it should’
•Final product meets the established design criteria
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Why is a Design ProcessImportant?
Difficult to overcome “poor design” costs with “efficientmanufacturing” costs
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Why is a Design ProcessImportant?
Design cost is relatively low
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Engineering Design
Best Learned by Doing
Project Definition
•Who is the client?
•What is the Original Problem Statement
•Who are the “stakeholders?”
•“Deliverables”— What is the final product delivered to the customer?– Design Proposal– Physical prototype?
• Functional or form only? Combination?– Virtual prototypes?
• Simulations and computer programs• CAD models
– Drawings?• CAD models, layouts, P&ID diagrams
– Presentation to customer?– Installation on site?
Project Definition: Decide on the Scope
•Scope is critical– How big is your obligation?– Where does your responsibility begin and end?
• Physically—in a system, building, product?• Details—Physical decomposition at top level, or all the way down to
literally each nut and bolt?• Commercial Off-the-shelf (COTS)?• Electrical and software control – designed from scratch, or COTS?
Who does the interface, and how deep?
Project Definition: Scope
The proposal documents a clear understanding of:– Client and stakeholders– Needs (the “What” they need)– Objectives, Constraints and Specifications (the “How” your design
satisfies these needs)•Final Proposal / Report
– Refined Pre-Proposal– Clear communication of design concept
• Physical• Functional• Analyses to make it work
•The “Final Proposal Document” becomes a contract to complete a job inthe real world
Project Definition: Within the Proposal
Project Definition: Ask Questions
• Clarify what the client wants
• What do the stakeholders (users) require?
• Are there any experts in the field?– State of the Art– Existing limitations
Project Definition:Identify Objectives and Constraints
• Need – The customer’s perceived (and oZen vague) lack ofresource, system or product
• Objec(ve – The design’s func-ons or characteris-cs that willaddress the Needs
• Constraint – A boundary condi-on on the problem. Limit thesize of the design space.
Project Definition:Assign weights to the objectives
Some Objec-ves more important than others! Weigh-ng should be on a 9, 3 or 1 basis.
9 is the most important objec-ve / constraint (limited to one or two objec-ves)
1 is the least important objec-ve
Team needs to agree on weigh-ng – strategies to come to an agreement Individual weigh-ng – average together
Majority vote while no-ng the minority voice
Objectives & Specifications
•Categorization of Objective– Readable– Understandable
•Specifications are the product/system characteristics that you canmeasure from your designed result – metrics by which to test theobjective– Calculations– Physical Prototype– Virtual prototype or simulation
Objectives & Specifications
•The more specifications you leave blank or unspoken,– Customer may set them for you– May lead to unrealistic expectations– Customer may reject proposal for incompleteness– This is YOUR CHANCE to control what you will be working towards.– Don’t let the customer make the project harder by setting the specs for
you!
Quality Function Deployment
Identify customer wants Identify how the good/service will satisfy customer wants Relate customer wants to product hows Identify relationships between the firm’s hows Develop importance ratings Evaluate competing products Compare performance to desirable technical attributes
QFD House of Quality
Relationshipmatrix
How to satisfycustomer wants
Interrelationships
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Technicalevaluation
Target values
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ratingsratings
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House of Quality Example
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House of Quality Sequence